| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic balance with a static elimination function, which is provided with a self-diagnostic function of static elimination ability and is capable of diagnosing suitable cleaning/replacement timing of a static elimination needle by itself while considering a deterioration state.SOLUTION: An electronic balance 1 including a weighing chamber 5, a load measuring mechanism 13 and static elimination means 11A to 11D each on which one or more plus static elimination needles and the same number of minus static elimination needles are arranged includes also needle deterioration evaluation means for applying/stopping voltage to the static elimination means 11A to 11D, detecting variation of measurement data in no load before and after applying the voltage by the load measuring mechanism 13 and finding out an inherent variation amount of the measurement data. Variation of the measurement data in no load following ion air caused by corona discharge from each static elimination needle is measured by the load measuring mechanism, an evaluation index for self-diagnosis of static elimination ability is acquired by the needle deterioration evaluation means, and while considering a deterioration state of the static elimination needle, needle cleaning/replacement timing is diagnosed by the electronic balance itself. |
